Cleanup: change PIDs to base::ProcessId (or pid_t)

chrome/renderer/render_thread.cc

Index: chrome/renderer/render_thread.cc
diff --git a/chrome/renderer/render_thread.cc b/chrome/renderer/render_thread.cc
index 0e68f82aeaf02795a63c3c8a5da7d72d38d373f8..df843bcb36e4010d9541f5e26fa7964c159cd605 100644
--- a/chrome/renderer/render_thread.cc
+++ b/chrome/renderer/render_thread.cc
@@ -380,7 +380,7 @@ void RenderThread::OnGetRendererHistograms(int sequence_number) {
 void RenderThread::OnGetRendererTcmalloc() {
   std::string result;
   char buffer[1024 * 32];
-  int pid = base::GetCurrentProcId();
+  base::ProcessId pid = base::GetCurrentProcId();
   MallocExtension::instance()->GetStats(buffer, sizeof(buffer));
   result.append(buffer);
   Send(new ViewHostMsg_RendererTcmalloc(pid, result));